I think my PCB doesn’t work because I have an MCP2551 that is supposed to run at 5v and my circuit is feeding it 3.3v. I’m looking for the easiest replacement. My first google hit is https://www.microchip.com/forums/m851300.aspx suggesting the SN65HVD232. Does that pass the smell test?
SN65HVD230 looks to be a true drop-in replacement. I didn’t run the math to see if the Rs resistor values line up, if you were using slew-rate limiting, but if I had to guess I’d say they do.
SN65HVD231 is probably a drop-in replacement in most applications (it’s the same, except its low power mode turns off the receiver, while MCP2551 and HVD230 leave it running).
SN65HVD232 is also probably a drop-in replacement in most applications, but it omits the standby mode, slew rate control and Vref functions entirely.
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